[streams] Fixed typo (#404)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/404

-- Commit Summary --

  * Fixed typo

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/404.patch
https://github.com/whatwg/streams/pull/404.diff

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https://github.com/whatwg/streams/pull/404